Zhao Fengfeng, Quan Hui, Zhang Shijun, Xu Yihui, Zhou Zheng, Chen Guangxin, Li Qifang
College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Sinopec (Beijing) Research Institute of Chemical Industry Co., Ltd., Beijing 100013, China.
Polymers (Basel). 2023 Jan 10;15(2):356. doi: 10.3390/polym15020356.
Graphene conductive inks have attracted significant attention in recent years due to their high conductivity, corrosion resistance, and environmentally friendly nature. However, the dispersion of graphene in aqueous solution is still challenging. In this work, we synthesized an amphiphilic graft copolymer, polyvinyl alcohol-g-polyaniline (PVA-g-PANI), and studied the graphene dispersion prepared with the graft copolymer by high-speed shear dispersion. The amphiphilic graft copolymer can be used as a stabilizer and adhesive agent in graphene dispersion. Given the steric hindrance of the graft copolymer, the stability of graphene dispersion is improved by decreasing the probability of π-π stacking. PVA-g-PANI has a better stability on graphene dispersion than carboxymethylcellulose sodium (CMC-Na) and a mixture of PVA and PANI. The graft copolymer has only a slight effect on the conductivity of graphene dispersion due to the existence of conductive PANI, which is beneficial for preparing the graphene dispersion with good conductivity and adhesion. Graphene dispersion is well-adapted to screen printing and is very stable with regard to the sheet resistance bending cycle.
近年来，石墨烯导电油墨因其高导电性、耐腐蚀性和环保特性而备受关注。然而，石墨烯在水溶液中的分散仍然具有挑战性。在这项工作中，我们合成了一种两亲性接枝共聚物，聚乙烯醇-g-聚苯胺（PVA-g-PANI），并通过高速剪切分散研究了用该接枝共聚物制备的石墨烯分散体。这种两亲性接枝共聚物可作为石墨烯分散体中的稳定剂和粘合剂。鉴于接枝共聚物的空间位阻，通过降低π-π堆积的概率提高了石墨烯分散体的稳定性。PVA-g-PANI对石墨烯分散体的稳定性优于羧甲基纤维素钠（CMC-Na）以及PVA和PANI的混合物。由于导电聚苯胺的存在，接枝共聚物对石墨烯分散体的导电性影响较小，这有利于制备具有良好导电性和附着力的石墨烯分散体。石墨烯分散体非常适合丝网印刷，并且在表面电阻弯曲循环方面非常稳定。
